Exits and blocked exits

Rooms connect with direction lines. Ten directions exist: the eight compass points plus up and down. A connection is one-way as written; write the return exit in the other room.

create the Rose Walk
  a room
  north to the Herb Garden
  east to the Orchard
  south is blocked: hedge-too-thick

  Gravel crunches underfoot between the rose beds.

A blocked exit refuses travel and speaks the named phrase (the key after the colon names a phrase the story defines, a single kebab-case word; dots are illegal, ADR-254). The block can be conditional:

create the Orchard
  a room
  west to the Rose Walk
  up is blocked while the ladder is not here: no-way-up

  Apple trees stand in crooked rows.